The greater change is the addition of Google+ sharing. Google has replaced the "Like" button with the +1 button, which lets users share content to their Google+ accounts. Reader users with a Google+ login can choose which circles they'd like to share articles to using Google+ snippets.

The Google+ integration replaces the Google Reader social features the company unveiled in 2009. "Integrating with Google+ also helps us streamline Reader overall," Google Engineer Alan Green said in a blog post. "So starting today we'll be turning off friending, following, shared items and comments in favor of similar Google+ functionality."

While Google Reader's notes got some usage, dropping them in favor of Google+ is the logical move for a company that is now trying to unify all of its social efforts under one banner. The company recently killed off Buzz while adding Google+ to Maps.

What do you think of the new Google Reader? Let us know in the comments.

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